Copy holder



COPY HOLDER 4 SheetsSheet 1 Filed Aug. 8., 1958 Aug. 29, .1939. WELTER2,171,261

COPY HOLDER v Filed Aug. 8, 1938 4 Sheets-Sheet 2 g- 1939- H. c. WELTER2,171,261

COPY HOLDER Filed Aug. 8, 1938 4 Sheets-Sheet 3 59 a J7 15 1E lLLl Aug.29, 1939. WELT'ER 2,171,261

COPY HOLDER Filed Aug. 8, 1958 4 Sheets-Sheet 4 INVENTOR.

Patented Aug. 29, 1939 UNi'iED STATES PATENT OFFICE.

COPY HOLDER Application August 8,

11 Claims.

My present invention relates to copyholders that are used to facilitatethe reading and transcribing of notes and writings and particularlycopyholders of the type designed to be set behind typewriters andadapted to be operated as to line indications conveniently from near thekeyboard of the machine, and it has for its object to provide a simple,quiet and efficient device of this kind. The improvements are directedin part toward providing the type of fixed line indicator and movablecopy plate machine with rotary op erating means extending forwardlytherefrom toward the keyboard of the typewriter but in whichnevertheless such operating means may be quickly folded across the faceof the copy plate to render the copyholder compact for storage andship'- ping; toward rendering such operating means effective atdifferent angles other than its precise forward position; towardrendering such operating device extensible and retractable for differentdesired positions of the copy plate; toward provisions whereby thecopyholder may be picked up and manipulated by means of its copy platewithout movement relatively to its support and the actuating mechanismthereon, and toward providing a novel elevating means that will functionindefinitely without perceptible wear. To these and other ends, theinvention resides in certain improvements and combinations of parts, allas will be hereinafter more fully described, the novel features beingpointed out in the claims at the end of this specification.

In the drawings:

Fig. 1 is a front elevation of a copyholder constructed in accordancewith and illustrating one embodiment of my invention with the copy platethereof in a partially raised position;

Fig. 2 is a top plan view, much enlarged, and showing the operatingmeans in folded position in dotted lines;

Fig. 3 is a fragmentary vertical central section of pper portion of thecopy plate and its standard, taken substantially on the line 33 of Fig.2 and on the same scale;

Fig. 4 is a front View of the operating mechanism as in Fig. 1 out onthe scale of Fig. 2 and shown in transverse section through the shaft onthe line i of that figure;

the

Fig. 5 is a rear elevation on the scale of Fig. 2

partly broken away and with the cover plate on a portion of the standardremoved to reveal interior parts;

Fig. 6 is a further enlarged fragmentary sectional detail on line 6-43of Fig. 1 and showing 1938, Serial No. 223,598

features of the connection of the elevating means to the copy plate;

Fig. '7 is a detail view partly broken away of a clutch elementsimilarly appearing in Fig. 5;

Fig. 8 is a further enlarged detail perspective 5 of an element involvedin the aforesaid attachment of the elevating member;

Fig. 9 is an enlarged fragmentary side view of the hinged end of theside arm and operating member in normal operating position taken fromthe inside;

Fig. 10 is a fragmentary top View of the same adjusted to a differentposition;

Fig. 11 is a view similar to Fig. 9 but taken from the opposite or outerside;

Fig. 12 is a fragmentary vertical section taken substantially on theline l2-l2 of Fig. 11;

Fig. 13 is a horizontal section taken substantially on the line !3|3 ofFig. 9;

Fig. 14 is a similar section showing the operating arm broken as infolding;

Fig. 15 is an inner side View of the side arm supporting the operatingmechanism with adjacent portions respectively of a. bearing bracketattaching it to the copy plate standard and an extension arm, the viewbeing in longitudinal central section through the operating shaft andconnected parts;

Fig. 16 is an enlarged top view broken away at both ends of the clutchconnection between the operating shaft and the actuating shaft with theclutch elements in partial engagement;

Fig. 17 is a similar View with the clutch elements disengaged as theyappear when the copyholder is folded;

Fig. 18 is an enlarged detail of the pawl spring shown in Fig. 5, and

Fig. 19 is an enlarged perspective View with adjacent parts broken awayof the copy plate elevating tape and its winding drum.

Similar reference numerals throughout the several views indicate thesame parts.

Although all of my present improvements are not necessarily limited tocopyholders of the fixed line indicator and movable copy type, I haveillustrated an embodiment of this character and will first outline itsgeneral construction and mode of operation so that the improvements Ihave made thereon will be more readily understood. Referring moreparticularly to the drawings and first to Figs, 1, 2 and 5 thereof, lindicates the base of an upright standard embodying rigid guide rods 2at the sides connected at their upper ends in fixed relationship by across head plate 3. A vertically movable copy plate 4 slides 55 on theseguides which it engages with its curled semi-cylindrical margins 5. Atits top it carries a suitable spring pressed paper clamp 6 for holdingthe pages of the copy on the plate, which clamp is in the form of a wirebail mounted in bearing housings I on lateral extensions of the plate;The top edge of the latter is spanned by a helical spring 8 of slighttension to retain beneath it the pages as they are turned back. At therear of the machine a transverse shaft 9 mounted in bearings IE] on thelower portion of the cross plate 3 carries jointed arms II which in turnsupport a swinging line indicator I2 that may be thus adjusted towardand from the copy plate for thickness of copy and up and down the facethereof accordingly as the writings are placed high or low on the copysheet.

Means are provided for raising the copy plate with a step-by-stepmovement past the line indicator until at its limit of movement or atany desired intermediate point it is released to fall by gravity to anextreme low position on the base I. In the present instance, this meansembodies a central narrow vertical housing fixed at its lower end to thebase I and at its upper end to the cross plate 3. Adjacent its lower endand partially protruding into this housing is a winding drum I4, theperiphery of which provides a central narrow winding surface flanked byconverging or generally V-shaped flanges. The drum turns on an axle I5supported on brackets It on the base and has a cavity It on its rearside to house a suitable counterbalancing spring (not shown) whichhousing is closed by a fixed cover plate I8 carried by the axle. Therear of housing I3 is also closed by a cover plate I!) completing thewell for the tape appearing in Figs. 2 and 3.

At the top of this well or housing is a small pulley 28 on a stud 2|projecting rearwardly from the fixed cross plate 3 and whichincidentally constitutes the means for securing the top of the housingin fixed position. A two-piece tape 22-23, about which more will be saidlater, is connected at one end to a stud 24 at the bottom margin of thecopy plate and passes thence upwardly over pulley Z3 and downwardlyaround winding drum I l. A slot 25 in housing plate I3 admits the studto the housing or well in which the tape is confined. It will thus beseen that, as the drum I4 is rotated in a clockwise direction (as viewedfrom the rear) it will raise the copy plate, and, when released, willallow the copy plate to fall by gravity.

As a matter of fact, the copy plate when so released for downward returndoes not reach the base I close enough to strike it. On the other hand,it is halted just out of contact by pairs of cooperating rubber buffers26 and 21 at each side, one of which is clamped to the top of the guide5 and the other of which is secured to the top of the guide rod 2, aspring 28 being also carried by the first mentioned buffer to furtheravoid noisy and wearing impact and to protect the screw head shown asholding the other buffer of the couple.

The immediate actuating means for transmitting step-by-step rotationto'the drum I4 is a wheel 29 having slightly converging side walls atits periphery that jam between the flanges of the wheel It onlysufiiciently to establish driving frictional contact. The wheel is fixedon a shaft 36 (Fig. 5) which, through intermediate connections, isturned by a hand knob 3I arranged forwardly beside the keyboard of thetypewriter.

Fitting into an annular groove within. the rear face of wheel 29 is ahousing 32, best shown in Figs. 5 and '7, which housing constitutes theball race of a one-way ball clutch of familiar type. An element 33 onthe shaft 3!] forms tapered pockets with the ball race so that thespring pressed balls shown will jam against the race when the shaft isturned in one direction establishing the clutch connection and releasewhen the shaft is turned in the other direction in a well known manner.

An extension on the clutch housing 32 is pivoted at 34 near theperiphery of the wheel 29 to a bell crank arm 33, the other end of whichis pivoted on the axle I 5. Substantially on the dead center between thelatter and shaft 30 is an extension spring 36 connected at one end to alug on the arm 35 and at the other to a lug on the housing 32. Thebearing 31 (referring briefly now to Figs, 9 and of shaft 30 is carriedby an upright bearing bracket 38 hinged at 39 at a low point on the baseI so that it may swing laterally toward and from the base. Through thismeans the spring 36 holds the otherwise floating operating wheel 29 inoperative frictional engagement with the drum I4 and as the hand lunch35 at the front is turned clockwise (as viewed from the front) thisrelationship will be maintained and the wheel positively driven becausethe ball clutch is free to turn within the housing 32. The drum willhence turn in a counterclockwise direction (also from the front) and thetape 23 will be wound thereon and the copy plate raised. When, however,the knob 3| is reversed, the ball clutch will lock the shaft 30 andwheel 29, by reason of the ball clutch, to the housing 32. Theoff-center pivot 34 thereof will then react against the unyielding arm35 and throw the housing, shaft and wheel outwardly on the hinge center39 against the tension of spring 35 so that drum I4 is released from thewheel. The copy plate will fall by gravity, unwinding the tape from thedrum. When the hand operation is released, all parts restore themselvesto normal operative position through the action of spring 36.

The foregoing acquaints the reader with the general subject matter. Ishall now proceed to describe the specific improvements that my presentinvention involves.

The bearing bracket 38, shown in side view from the inside in Fig. 9 andin side view from the outside in Fig. 11, extends only slightlyforwardly of the base I of the standard and is there hinged at 40 on avertical axis and on the inside to a relatively long, normally forwardlyextending side arm 4I (see also Figs. 2 and 15). Slidable in this sidearm is an extension arm 42. Both are composed of sheet metal, in thepresent in.- stance, the extension being fiat and the side arm beingprovided with a. flanged runway 43 at its bottom edge and a retaininglug 44 engaging over the upper edge of the extension, which latter isprovided with a screw 45 abutting the lug 44 as a stop to prevent theextension from being entirely withdrawn. At its forward end, theextension has a leg 45 on which is a vacuum cup 41 while an upperextension 48 provides bearings for the operating mechanism and generallysupports it at the front as well as providing a brace extension for thecopy plate standard as a whole to maintain it erect.

The upper edge of the side arm 4| (see also Fig. 12) is rolled into abearing 49 containing a rotatable sleeve 50. This sleeve has a stopcollar 5! at its forward or outer end adjacent the end of the bearingand pinned to the sleeve at its inner or rear end is a clutch element52. A complementary clutch element 53 is pinned to the forward end ofactuator shaft 30, which forward end projects beyond such clutch member,which is tubular, and is pointed or rounded to provide a centering meansentering clutch element 52, which is also tubular. Interposed betweenthe latter and the bearing 49 for its sleeve and coiled about therearwardly projecting end of the sleeve is a compression spring 54, thetendency of which is obviously to hold the clutch elements in operativecooperation to turn the actuating shaft 30 from the sleeve when theparts are in the normal positions of Figs. 1, 2, 9, 15, etc., that is,with the rotating elements in alinement. However, it is the purpose tomake the operating mechanism including the side arm and all itsconnections foldable across the face of the copy plate and standard fromthe operative position shown in full lines in Fig. 2 to an inoperativeposition shown in dotted lines in the same figure. This is effected bysimply swinging the whole structure inwardly and rearwardly on the hinge40. When this is done, the folding motion is limited by a right anglebracket flange or lug extending inwardly from the side arm 4| andencompassing the knuckle and pintle of hinge 40, the lug ultimatelystriking against the bearing member 38. On the other side of the sidearm is a spring latch 56 that catches over a suitable locking abutment5'! on the bearing member 38 to hold the parts rigidly in extendedoperative position. This latch is strong enough for this purpose but canbe overcome by sudden pressure of the hands in folding.

This general construction and mode of operation of the connectionbetween the operating mechanism and the actuating mechanism for thewinding drum and copy plate gives'rise to a particular design of clutch,as shown in the various figures, particularly the enlarged views. Theclutch faces are annuluses with sharp and deep cut serrated facesconstituting complementary rings of teeth. These cut teeth are not cutstraight across the diameter but on each radii toward the center so thattheir apexes constitute a knife edge line, the forming out being widerand deeper on the outer circumference of the tubular clutch element thanon the inner. The result is that the teeth may contact with each otherover their entire side surfaces and their apexes reach to the verybottoms of the complementary intervening spaces on the companion member.There is, therefore, very slight tend.- ency for them to disengage underthe rotary drive of one by the other and the spring 54 though small isentirely adequate to insure and maintain firm engagement.

Also, this clutch construction provides another function. Because of itspeculiar nature, some of the teeth remain in mesh when the side arm andoperating gear is neither completely extended nor completely folded butin a position intermediate the two positions of Fig. 2. In other words,when the swinging operating sleeve and the fixed actuating wheel shaftare out of alinement to a considerable degree, as in Fig. 10, theoperation is not materially interfered with. This feature is of value inusing the copyholder with special writing machines or for specialpurposes where it is more desirable to have the operating knob overtoward the center of the copy plate rather than projecting straight outfrom its side. The

function is attributable in part to the fact that the vertical axis ofthe hinge 40 is so nearly tangential to the clutch tube peripheries andthe pitch line of their mesh that only a bare disengaging sep-aration ofthe nearest teeth suiiicient to allow them to swing on each otheroccurs, as is illustrated in Fig. 17. In fact, the driving of one clutchelement by the other can be effected almost as readily in the foldeddotted line position of Fig. 2, as in the full line position for theelements are never completely out of mesh and the effect is that of auniversal joint.

Still referring principally to the same figures, the sleeve 53 carryingthe clutch element 52 is not turned directly by the hand knob 3|. It hasbeen explained that the sliding extension 42 of the side arm 4! carriesthe leg 46 and the upper extension 48 thereof and the said knob isarranged forwardly of these. A hearing 53 in extension 48 carries anoperating shaft 55 to the protruding end of which the knob 38 isdirectly fixed. This shaft extends into the sleeve 59 in telescopicrelationship so that as the extension 42 is drawn out or pushed in theshaft will slide with it. The sleeve and shaft are, however, lockedtogether for rotation by a feather 6i! (Fig. 15) stamped into the sleevethat runs in a groove 6| in the shaft, as does the set screw 62 thatholds the stop collar M on the sleeve.

In addition to the knob 3| another means is provided (Figs. 1, 2 and 4)for intermittently rotating the operating shaft and sleeve tocommunicate the step-by-step movement through striking an angularlydisposed key lever 63 with the heel of the hand, which some operatorsprefer over grasping the knob, such lever also being convenientlyarranged at the side of the keyboard in a position adjacent to the knobbut slightly rearwardly thereof. This key lever is yoke-shaped in crosssection and is itself freely mounted to turn on shaft 59 and coiledabout the latter are several convolutions of a spring 54 that normallyholds the lever against a stop lug 65 extending forwardly from extensionplate 58. The other end of the spring reacts against a lug 6% on the leg46. Through a connected arm 68 on which is pivoted at if! a pawlembodying a shoe H, such key lever 53 is adapted to intermittentlyrotate a finely-toothed ratchet wheel 6'! fixed on the operating shaft5.5. Further details of this ratchet mechanism are considered immaterialto the claimed invention of this application. The throw of the lever andthe mechanism carried thereby is regulated by a stop screw 75 threadedthrough a post T5 on the extension support it. The purpose of having thepawl and ratchet normally out of engagement is, of course, to permitfree movement of the shaft through the other operating means, namely,the hand knob 3 I.

Attention is now directed to the figures more particularly illustrativeof the elevating tape 22 23. The metal portion 23 thereof is a very thinnarrow ribbon which winds and unwinds on the drum M with facility andwithout appreciable wear because of the large diameter. The top pulley26, however, is necessarily very small causing such abrupt bending ofthe metal strip that with constant use the latter becomes fatigued andis apt to crystallize and break. It is for this reason that I make thetape in two parts, the part 22 that works on roller 20 being a strongwoven textile which will run on the roll iniiefinitely with out showingappreciable wear. The two are connected together by a link 7'. engagingin loops on the two ends but this splice never reaches either pulley.

The lower end of tape 22 is connected to the lower portion of the copyplate 4 through the medium of a stop pawl 78 as clearly shown in Figs. 5and 19, which pawl is pivoted on the beforementioned stud 2d. Theadjacent side wall of the wheel housing [3 is provided with a series ofstop openings 19 punched therefrom in the nature of a rack. When thetape is under winding tension, a tooth 38 on pawl 18, which latter isthereby straightened out, runs free of the stops 79 but if the operatorgrasps the top of the copy plate to pick the machine up thereby, as itis very natural to do, a slack will occur in the elevating tape allowingthe spring to throw the tooth so into locking engagement with the nextadjacent stop so that the copy plate raises the whole machine throughthe medium of the pawl.

The said spring 8! is shown in enlarged detail in Figs. 8 and 18 toillustrate the mode of attaching it. A nut 32 on the stud 24 thatconfines the pawl is provided with a kerf 83 that runs down intointersection with the cooperating threads of the nut and stud. Thestraight wire spring is lodged in the bottom of this kerf to lock thenut on the stud and is maintained there by pinching together the wallsof the kerf. In this way the spring is rigidly mounted in a convenientmanner and at the same time performs the looking function. Its lower endis turned out angularly in the kerf to prevent rotation on itslongitudinal axis and consequent disengagement from the pawl.

Reverting to the clutch connection between the actuating shaft 35! andthe operating sleeve and shaft 59 and iii, Figs. 9, l0 and 11 show onlya partial compression of spring 54 where the clutch elements 52 and 53are in alined engagement or nearly so. In Fig. 17 where the side arm isfolded and the cutch elements are at right angles, the expansion of thisspring is at its maximum. In Fig. 16 the sprin is completely compressedbetween the clutch 52 and bearing 49 because in this view the hand knob3! is being reversed to allow the copy'plate to fall in the mannerexplained. Such compression is due to the riding of one set of clutchteeth on the other, as shown, but complete disengagement is not reached(and, of course, should not be) due to the proportioning of the springwithin the limited space referred to. In other words, when the clutchelements, on the reversal of the shafts, start to move apart slightly,spring 56, wholly compressed, becomes like a rigid abutting element.

I claim as my invention:

1. In a copyholder, the combination with a standard, a copy plate and aline indicator carried thereby, one of which is adapted to be raised andlowered relatively to the other, and elevating means on the standardconnected to such movable element and embodying a rotary element havinga shaft extending transversely relatively to the copy plate, of anormally forwardly extending side arm hingedly connected to the standardto fold across the face thereof, an operating shaft on the side arm, anda clutch connection between the latter shaft and that of the rotaryelement.

2. In a copyholder, the combination with a standard, a copy plate and aline indicator carried thereby, one of which is adapted to be raised andlowered relatively to the other, and elevating means on the standardconnected to such movable element and embodying a rotary element havinga shaft extending transversely relatively to the copy plate, of anormally forwardly extending side arm hingedly connected to the standardto fold across the face thereof, an operating shaft on the side arm, anda clutch connection between the latter shaft and that of the rotaryelement, said clutch embodying tubular elements on the respective shaftshaving complementary serrated end faces adapted to intermesh operativelywhen said shafts are out of alinement to a considerable degree.

3. In a copyholder, the combination with a standard, a copy plate and aline indicator carried thereby, one of which is adapted to be raised andlowered relatively to the other, and elevating means on the standardconnected to such movable element and embodying a rotary element havinga shaft extending transversely relatively to the copy plate, of anormally forwardly extending side arm hingedly connected to the standardto fold across the face thereof and having a tubular bearing therein, anoperating shaft in the bearing, a clutch connection between the lattershaft and that of the rotary element, said clutch embodying tubularelements on the respective shafts having complementary serrated endfaces adapted to intermesh operatively, and a compression springinterposed between the clutch element of the operating shaft and thebearing thereof.

' 4. In a copyholder, the combination with a standard, a copy plate anda line indicator carried thereby, one of which is adapted to be raisedand lowered relatively'to the other, and elevating means on the standardconnected to such movable element and. embodying a rotary element havinga shaft extending transversely relatively to the copy plate, of anormally forwardly extending side arm hingedly connected to the standardto'fold across the face thereof, an operati'ng shaft on the side arm,and a clutch connection between the latter shaft and that of the rotaryelement, one of said shafts being resiliently yielding as to end thrust.

51 In a copyholder, the combination with a standard, a copy'plate and aline indicator carried thereby, one of which is adapted to be raised andlowered relatively to the other, and elevating means on the standardconnected to such movable element and embodying a rotary elemerit havinga shaft extending transversely relatively to the copy plate, of anormally forwardly extending side arm hingedly connected to the standardto fold across the face thereof, said arm having a tubular bearingtherein, a sleeve in the bearing resiliently yielding as to end thrust,an operating shaft in the sleeve feathered thereto and extensibletherefrom, and a clutch connection between the tube bearing and theshaft of the rotary'element.

6. In a copyholder, the combination with a standard, a copy plate and aline indicator carried thereby, one of which is adapted to be raised andlowered relatively to the other, and elevating means on the standardconnected to such movable element and embodying a rotary element havinga shaft extending transversely relatively to the copy plate, of anormally forwardly extending side arm' hingedly connected to thestandard to fold across the face thereof, an operating shaft on the sidearm, and a clutch connection between the latter shaft and that of therotary element, the hinge connection of the arm having a vertical axisarranged tangentially to the gripping faces of the clutch elements.

7. In a copyholder, the combination with a standard, a copy plate and aline indicator car- 75 ried thereby, one of which is adapted to beraised and lowered relatively to the other, and elevating means on thestandard connected to such movable element and embodying a rotaryelement having a shaft extending transversely relatively to the copyplate, of a normally forwardly extending side arm hingedly connected tothe standard to fold across the face thereof, said arm having a tubularbearing therein, a sleeve in the bearing resiliently yielding as to endthrust, an operating shaft in the sleeve feathered thereto andextensible therefrom, a clutch connection between the tube bearing andthe shaft of the rotary element, and an extension on the side armslidably joined thereto, said extension being provided with a supportingleg, a bearing for the operating shaft, and a hand control for manuallyoperating the latter.

8. In a copyholder, the combination with a standard, a copy plate and aline indicator carried thereby, one of which is adapted to be raised andlowered relatively to the other, and elevating means on the standardconnected to such movable element and embodying a rotary element, of aside arm extending transversely relatively to the copy plate and havinga tubular bearing therein, a sleeve in the bearing, and an operatingshaft within the sleeve feathered thereto and extensible therefrom andoperatively connected to the rotary element.

9. In a copyholder, the combination with a standard, a copy plate and aline indicator carried thereby, one of which is adapted to be raised andlowered relatively to the other, and elevating means on the standardconnected to such movable element and embodying a rotary element, of aside arm extending transversely relatively to the copy plate and havinga tubular bearing therein, a sleeve in the bearing, an operating shaftwithin the sleeve feathered thereto and extensible therefrom andoperatively connected to the rotary element, an extension on the sidearm slidably joined thereto, said extension being provided with asupporting leg, a bearing for the operating shaft, and a hand controlfor manually operating the latter.

10. In a copyholder, the combination with a standard, a copy plate and aline indicator carried thereby, one of which is adapted to be raised andlowered relatively to the other, an elevating means on the standardconnected to such movable element and embodying a drum, and a flexibleelement wound thereon, of a bearing bracket hinged on a horizontal axisto the base of the standard and carrying a forwardly offset verticalknuckle and a horizontally disposed bearing, a shaft in the latterbearing, a rotary element on the shaft cooperating with the drum torotate the same in one direction, a side arm having a pintle in theknuckle of the bracket member whereby the side arm may be folded acrossthe face of the standard, a latch for locking the side arm relatively tothe bearing bracket so that it extends forwardly from and transverselyof the copy plate, said side arm being provided with a tubular bearing,a sleeve within the latter bearing feathered thereto so that it isadjustably extensible therefrom, and cooperating clutch elements on theinner end of the sleeve and on the outer end of the shaft of theaforesaid rotary element.

11. In a copyholder, the combination with a standard, a copy plate and aline indicator carried thereby, one of which is adapted to be raised andlowered relatively to the other, an elevating means on the standardconnected to such movable element and embodying a drum, and a flexibleelement wound thereon, of a bearing bracket hinged on a horizontal axisto the base of the standard and carrying a forwardly offset verticalknuckle and a horizontally disposed bearing, a shaft in the latterbearing, a rotary element on the shaft cooperating with the drum torotate the same in one direction, a side arm having a pintle in theknuckle of the bracket member whereby the side arm may be folded acrossthe face of the standard, a latch for locking the side arm relatively tothe bearing bracket so that it extends forwardly from and transverselyof the copy plate, said side arm being provided with a tubular bearing,a sleeve within the latter bearing feathered thereto so that it isadjustably extensible therefrom, and cooperating clutch elements on theinner end of the sleeve and on the outer end of the shaft of theaforesaid rotary element, one of which clutch elements is yieldinglyresilient to endwise thrust.

HERMAN G. WELTER.

